package com.example.demo.utils;

import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * 时间 工具类
 * 
 * @author allen
 */
public class TimeUtil {

	/**
	 * 获取本周的开始时间
	 * 
	 * @return
	 */
	public static Date getBeginDayOfWeek() {
		Date date = new Date();
		Calendar cal = Calendar.getInstance();
		cal.setTime(date);
		int dayofweek = cal.get(Calendar.DAY_OF_WEEK);
		if (dayofweek == 1) {
			dayofweek += 7;
		}
		cal.add(Calendar.DATE, 2 - dayofweek);
		return getDayStartTime(cal.getTime());
	}

	/**
	 * 获取本周的结束时间
	 * 
	 * @return
	 */
	public static Date getEndDayOfWeek() {
		Calendar cal = Calendar.getInstance();
		cal.setTime(getBeginDayOfWeek());
		cal.add(Calendar.DAY_OF_WEEK, 6);
		Date weekEndSta = cal.getTime();
		return getDayEndTime(weekEndSta);
	}

	/**
	 * 获取本月的开始时间
	 * 
	 * @return
	 */
	public static Date getBeginDayOfMonth() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(getNowYear(), getNowMonth() - 1, 1);
		return getDayStartTime(calendar.getTime());
	}

	/**
	 * 获取本月的结束时间
	 * 
	 * @return
	 */
	public static Date getEndDayOfMonth() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(getNowYear(), getNowMonth() - 1, 1);
		int day = calendar.getActualMaximum(5);
		calendar.set(getNowYear(), getNowMonth() - 1, day);
		return getDayEndTime(calendar.getTime());
	}

	/**
	 * 获取上个月的开始时间
	 * 
	 * @return
	 */
	public static Date getBeginDayOfLastMonth() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(getNowYear(), getNowMonth() - 2, 1);
		return getDayStartTime(calendar.getTime());
	}

	/**
	 * 获取上个月的结束时间
	 * 
	 * @return
	 */
	public static Date getEndDayOfLastMonth() {
		Calendar calendar = Calendar.getInstance();
		calendar.set(getNowYear(), getNowMonth() - 2, 1);
		int day = calendar.getActualMaximum(5);
		calendar.set(getNowYear(), getNowMonth() - 2, day);
		return getDayEndTime(calendar.getTime());
	}

	/**
	 * 获取本年的开始时间
	 * 
	 * @return
	 */
	public static Date getBeginDayOfYear(Integer year) {
		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.YEAR, year);
		// cal.set
		cal.set(Calendar.MONTH, Calendar.JANUARY);
		cal.set(Calendar.DATE, 1);

		return getDayStartTime(cal.getTime());
	}

	/**
	 * 获取本年的结束时间
	 * 
	 * @return
	 */
	public static Date getEndDayOfYear(Integer year) {
		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.YEAR, year);
		cal.set(Calendar.MONTH, Calendar.DECEMBER);
		cal.set(Calendar.DATE, 31);
		return getDayEndTime(cal.getTime());
	}

	/**
	 * 获取某个日期的开始时间
	 * 
	 * @param d
	 * @return
	 */
	public static Timestamp getDayStartTime(Date d) {
		Calendar calendar = Calendar.getInstance();
		if (null != d) {
			calendar.setTime(d);
		}
		calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0,
				0, 0);
		calendar.set(Calendar.MILLISECOND, 0);
		return new Timestamp(calendar.getTimeInMillis());
	}

	/**
	 * 获取某个日期的结束时间
	 * 
	 * @param d
	 * @return
	 */
	public static Timestamp getDayEndTime(Date d) {
		Calendar calendar = Calendar.getInstance();
		if (null != d) {
			calendar.setTime(d);
		}
		calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 23,
				59, 59);
		calendar.set(Calendar.MILLISECOND, 999);
		return new Timestamp(calendar.getTimeInMillis());
	}

	/**
	 * 获取今年是哪一年
	 * 
	 * @return
	 */
	public static Integer getNowYear() {
		Date date = new Date();
		GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
		gc.setTime(date);
		return Integer.valueOf(gc.get(1));
	}

	/**
	 * 获取本月是哪一月
	 * 
	 * @return
	 */
	public static int getNowMonth() {
		Date date = new Date();
		GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();
		gc.setTime(date);
		return gc.get(2) + 1;
	}
}
